Though its bit late:
Odds of drawing a Royal in a seven card stud is 30939:1 hands (wiki) irrespective of number of players. If two players you will get one in 30939/2 = 15470 deals. Think so.
Could be near to: 1/20 x 2/19 x 3/18 x 4/17 x 5/16
Tom your reply has really confused me lol …is it because I’m blonde ? 